<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.10/dist/vue.js"></script>
</head>

<body>
    <div id="app">
        <button @click="fullName='li zhuzhu'">change</button>
        <!-- 插值写法 -->
        <!-- <h1>名字是{{firstName.toLowerCase()+ '' +lastName.toLowerCase()}}</h1> -->
        <!-- 函数写法 -->
        <h2>全名是{{fullName}}</h2>


    </div>
    <script>
        Vue.config.productionTip = false;

        const vm = new Vue({
            el: "#app",
            data() {
                return {
                    firstName: "xia",
                    lastName: "zhuzhu",
                }
            },
            //用来书写计算属性
            computed: {
                fullName: {
                    get() {
                        console.log("getter");
                        return (
                            this.firstName.toLowerCase() + " " + this.lastName.toLowerCase()
                        )
                    },
                    set(val) {
                        this.firstName = val.split("")[0];
                        this.lastName = val.split("")[1]
                    }

                }
            },
        })
    </script>
</body>

</html>